@chaddng. Thanks for using my module. There is no limitation on the size of the file that can be uploaded by either this free version or the paid version. The max file size can be set by the module but that is limited by the PHP settings of your server. You need to find out what setting your PHP has for upload_max_filesize and post_max_size (and probably memory_limit as well). To check for this, in Joomla 1.5, go to Help -> System Info -> PHP Information. In Joomla 1.6 and 1.7, go to Site -> System Information -> PHP Information.
If upload_max_filesize or post_max_size is less than the size of the files you are trying to upload, then they won’t be uploaded.
Let me know what you values are, and we can sort it out together. All the best.